they are just spiritual beings that feed off energy that humans and other living creatures release during periods of heightened arousal, as for summoning.... well if you have excess energy to use and dont mind waking up disappointed and possibly sexually frustrated, yeah sure go ahead.

succubus are female sex demons, inccubus are the male equivalent. Are they dangerous? Yes and no. If they are real, they are a demon and therefore they can be tricky. [Not evil, but able to manipulate a situation] they are sexual demons who 'feed' off the energy produced during sex. Historically people have told tales of succubi/inccubi draining the life from their victim unknowingly. So they can be dangerous. So I suggest researching them fully before attempting to summon one so you know what you're doing. Personally, real or fake, I wouldn't summon a demon. I know why people summon succubi, but I'd rather meet a human. Granted if they aren't real you have nothing to fear, so research and draw your own conclusions.